Pump apparatus



J1me 1965 w. E. KRAMER ETAL 3,

PUMP APPARATUS Filed July 5, 1963 INVENTORS. MLL/4M E. M94416? JOE M. H/A/flA/AN ATTORNEY.

United States Patcr1t() 3,1%7,673 PUMP APPARATUS William E. Kramer, Fittsburgh, 1 2., and Foe M. Hindnran,

Kenedy, Tex assignors to Warren Petroleum Corporation, Tulsa, 2:12., a corporation of Delaware Filed July 5, 1963, Ser. No. 293,964 1 Claim. (Cl. 103-38) This invention relates to a pump and more particularly to a pump for metering measured quantities of lubricant and delivering the same to the point of lubrication with the regularity with which it is metered by the pumping plunger.

Pumps of the type herein defined are extremely troublesome in use. Such pumps are constantly losing prime on reduced deliveries with aerated oil. Means employed to adjust for positive known quantities of oil are not always reliable. In addition, such pumps are extremely difiicult to repair and therefore may require complete replacement in the event of a breakdown. The pump descr bed and claimed herein is extremely easy to use, adjust and, in the event of a breakdown, easy to repair.

The invention can better be understood from a consideration of the following detailed description taken in connection with accompanying drawings which are hereby incorporated and made part of the present disclosure.

FIGURE 1 is a vertical view, partly in section, of a.

pump in accordance with a preferred embodiment of the present invention. FIGURE 2 is a vertical view of a modified stroke adjustment means. FIGURE 3 is a crosssection taken along line Illll of FIGURE 2. PEG- URE 4 is a vertical view of still another modified stroke adjusting means.

Referring to the drawings, and particularly to FIGURE 1, reference numeral 2 denotes an oil-containing reservoir or tank wherein there is disposed a pump mechanism 4. Suitably attached by one or more bolts 6 or by any other means to cover 8 or even made integral therewith is casing 14). Pumping mechanism 4 is attached to the underside of casing 16 by one or more bolts 12 or by any other suitable means. Casing is provided with an oil passage 14 extending upwardly therethrough and an upwardly facing seat 16 on which there is mounted a ball check valve 18 normally urged against seat 16 by means of a spring 20, the upper end of which is held in place by nozzle element 22 screw threaded into the upper portion of casing 10. Nozzle element 22 is provided with an oil passage 24, one end of which communicates with oil passage 14- and the other end with means communicating with the zone to be lubricated with the oil moving upwardly therethrcugh.

Pumping mechanism 4 comprises a cylinder 26 provided with a central oil passage 28 extending axially therethrough. The upper portion of oil passage 23 is enlarged to provide upwardly facing seats 39 and 32 on which there is mounted a ball check valve 3 and a slightly larger ball check valve 36, respectively. Each of ball check valves 34 and 36 will always remain in the indicated respective positions, since at no time will there ever be room between ball check valve 36 and its seat 32 sufficient for ball check valve 34 to move therethrough.

Axially reciprocable within oil passage 23 of cylinder 26 is a piston 38 provided with a central oil passage 49 extending axially thercthrough. At its upper end o l passage 49 is provided with an upwardly facing seat 42 on which there is mounted a ball check valve 44-. The latter will always remain in the same relative position with respect to ball check valves 34 and 36, since at no time will there ever be room between ball check valve 34 and its seat sufficient to permit ball check valve 44 to move therethrough.

BAEZWB Eatented June 8, 1965 "ice Near its lower end piston 3% is provided with a collar 55 integral therewith or otherwise sec-uredly attached thereto. The lower end of piston 38 is threaded to receive a cap 48 provided with an oil passage 50 extend ing axially therethrough. The lower portion of oil passage St) is reduced in size to provide an upwardly facing seat 5'2 on which there is mounted a ball check valve 54 having a diameter slightly in excess of the diameter of oil passage 4'0. A spring 56 is interposed between collar 46 on piston 38 and shoulder 58 normally urging piston 33 out of oil passage 23. If desired the lower portion of cap 4-8 below ball check valve 54 can be provided with grooves extending laterally outwardly from oil passage 50 to facilitate communication to the interior of the pumping mechanism.

Threadingly attached on a base or otherwise fixedly secured in relation to the cylinder 26 and mount-ed in parallel relationship thereto is a spring holding device or rod so. The latter comprises an upper portion 62 of relatively large diameter and a lower portion '64 of somewhat smaller diameter. The latter portion is threaded to receive an adjustable nut es extending in the path of movement of collar 46 for limiting downward movement of piston 38 and thereby determining the length of its stroke and the amount of fluid removed from the tank with each such stroke. The downward movement of the piston 38 can be precisely limited and the amount of lubricant removed from the tank can thereby be accurately determined by mounting one or more shims 68 of the same or different thicknesses between adjustable nut 66 and shoulder '79. Thus shims of varying thicknesses can be made and the change in stroke each will provide can be determined beforehand so that when it is desired to obtain a desired stroke for removal from the tank of a selected amountof lubricant sufiicient shims can be placed in position between adjustable nut 66 and shoulder '70 to effect such purpose. A lock nut 72 is threadingly mounted on the lower portion 64 of spring holding device or rod 6%? for holding adjustable nut as in place. In the event the adjustable nut as may loosen under repeated vibration and cyclic loading over a long period of time, resulting in a change of delivery rate, a clevis-type holder 74 as shown in FTGUR'ES 2 and 3, can be removably mounted between shims 68 and adjustable nut 66. In this case the adjustable nut is reduced in size so that no cont-act is made with collar 46. When the clevis-type holder is mounted in place, the forks '75 thereof are in the path of downward movement of collar 46 and limit the downward movement of piston 38 as before. If desired, collar 46 can be appreciably reduced in size and a plate can be removably mounted between collar 46 so reduced, and cap 4.8. Such plate will be held fixed in place by the modified collar 46 and cap 43 and will function to hold spring 56 in place and :will be in proper abutting relationship with adjustable nut 65 or the clevis-type holder 74 for the intended purpose.

To obtain reciprocating movement of the piston 38 within cylinder 26, a cam-actuated lever '73 is provided in contact with cap 48. The lever can be operated in any desired manner for continuous or intermittentmovement of piston 38 within cylinder 26. Lever 73 is always so maintained in abutting relationship with cap 43 that it does not inhibit movement of fluid into oil passage Sli. In order to maintain a sealing relationship between cylinder 26 and piston 38, the inner portion of cylinder 25 is provided with a circumferential groove in which there is disposed a hard flexible material 89 such as rubber or a rubber-like plastic on the order of neoprene.

A modification of the stroke adjusting means of FIG- URES 1 and 2 is illustrated in FIGURE 4. In this modification, as such. would be made in the device of FIG- URE 1, for example, spring holding device or rod 6i? is threaded at the upper end thereof and extends downwardly into tank 2 through corresponding openings in cover 8 and casing 10. A nut 82 is threaded onto the upper portion of rod 64 to maintain the same in place. In this modification the shims 68 are not mounted at the lower end of rod 69 as shown in FIGURES 1 and 2 but between nut 82 and that portion of casing 16 immediately below the same. Rod 69 can be provided with a slot 84 in which a pin as slidably mounted in casing 19 extends to prevent rod 69 from turning. In thi embodiment the desired adjustment can desirably and easily be made outside of cover 8 and is at all times visibly apparent.

Assuming that pump mechanism 4 has been primed and the interior thereof is filled with fluid, when lever '78 moves piston 38 upwardly into the cylinder 26 ball valves 54 and 44,Will remain closed and fluid in fluid or oil passage 28 immediately above ball valve 44 and immediately below ball valve 34 will unseat the latter and progressively ball valve 36 and ball valve 18 and move into oil passage 24 for delivery to the zone to be lubricated, When lever 78 ceases its upward movement against cap 43 and spring 56 then moves piston 38 downwardly against adjustable nut 66 or clevis-type holder 74 ball valves 18, 34 and 36 are seated but ball valves 54 and 44 are unseated and, as a result of this, fluid enters fluid or oil passages 50, so and that portion of fluid passage 28 beneath ball valve 34.

Upon movement of piston 38 into cylinder 26 in response to the action of lever 78, movement of fluid through pump mechanism 4 is repeated as before.

s ame-7's Obviously many modifications and variations of the invention as hereinabove set forth can be made Without departing from the spirit and scope thereof and therefore only such limitations should be imposed as are indicated in the appended claim.

We claim:

A pump comprising a cylinder provided with an oil passage extending axially therethrough, a piston provided with an oil passage extending axially therethrough slida-bly and partially disposed within said first oil passage, a collar securely attached to said piston, a spring circumferentially disposed about said cylinder and said piston normally urging said piston outof said cylinder, a rod fixedly disposed adjacent said cylinder and said piston, and adjustable nut on said rod in the path of movement of said collar limiting outward movement of said piston from said cylinder, shims on said rod on one side of said adjustable nut for adjusting the position of said adjustable nut and a lock nut on said rod on the other side of said adjustable nut for holding said adjustable nut in place.

References Qited by the Examiner UNITED STATES PATENTS 718,933 1/03 Hurd 103-38 1,696,734 12/28 Scoville lO338 1,930,297 10/33 Welch lO338 1,976,493 10/34 Grifilth lO338 2,612,839 10/52 Denny lO338 LAURENCE V. EFNER, Primary Examinen 

